A225965 - OEIS

%I #9 Aug 05 2015 16:54:58

%S 1,13,117,928,7125,55527,451472,3896347,36098855,361638248,3932908263,

%T 46483325765,596325240445,8278698772954,123863754811374,

%U 1988038987565688,34070987657660446,620747700139873322,11975106447284305656,243741719070454243530

%N Number of permutations of [n] having exactly 4 strong fixed blocks.

%C See A186373 for the definition of strong fixed blocks.

%H Alois P. Heinz, <a href="/A225965/b225965.txt">Table of n, a(n) for n = 10..450</a>

%F a(n) ~ 3 * n! / n^8. - _Vaclav Kotesovec_, Aug 29 2014

%Y Column k=4 of A186373.

%K nonn

%O 10,2

%A _Alois P. Heinz_, May 22 2013